RSCABS: Rao-Scott Cochran-Armitage by Slices Trend Test

Performs the Rao-Scott Cochran-Armitage by Slices trend test (RSCABS) used
in analysis of histopathological endpoints, built to be used with either a GUI or by a
command line. The RSCABS method is detailed in "Statistical analysis of
histopathological endpoints" by John Green et. al. (2014) <doi:10.1002/etc.2530>.